Method and apparatus for increasing the strength of phase-based watermarking of an audio signal

Inactive Publication Date: 2016-12-29
MAGNOLIA LICENSING LLC
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  • Abstract
  • Description
  • Claims
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Benefits of technology

[0005]The invention is related to watermark detector compatible robustness increase of phase based watermarking systems. For increasing the robustness of the embedded watermark, not only phase modifications of the original audio signal are used for embedding a watermark signal, but also the magnitude of the original audio signal. The allowed change in magnitude is derived from the masking threshold, as it is the case for the phase modifications.
[0

Problems solved by technology

A challenge of audio watermarking systems in which an acoustic path is involved is the robustness against microphone pickup.
Especially in ca

Method used

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  • Method and apparatus for increasing the strength of phase-based watermarking of an audio signal
  • Method and apparatus for increasing the strength of phase-based watermarking of an audio signal
  • Method and apparatus for increasing the strength of phase-based watermarking of an audio signal

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Example

[0034]Even if not explicitly described, the following embodiments may be employed in any combination or sub-combination.

The Analysis-Synthesis Framework

[0035]In FIG. 1, the analysis-synthesis framework for audio watermark processing is depicted. It is common practice in audio processing to apply a short-time Fourier transform (STFT) for obtaining a time-frequency representation of the signal, so as to mimic the behaviour of the human ear.

[0036]The STFT consists in (i) segmenting an input signal x in frames xn having a length of B samples using a sliding window with a hop-size of R samples and, following multiplication by an analysis window wA in a multiplier step or stage 11, (ii) applying a DFT in a transformation step or stage 12 to each frame {tilde over (x)}n. This analysis phase results in a collection of DFT-transformed windowed frames {tilde over (X)}n which are fed to the subsequent watermarking processing 13 described in FIG. 9 in more detail, resulting in watermarked time ...

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Abstract

A challenge of audio watermarking systems in which an acoustic path is involved is the robustness against microphone pickup in case of surrounding noise. The strength of phase-based watermarking is increased by determining a masking threshold for a current frequency bin in a frequency/phase representation changing the phase based on that masking threshold and an allowed phase change value, calculating an allowed magnitude change value for the current frequency bin and calculating from an audio quality level value a magnitude change scaling factor for the magnitude change value, and increasing its magnitude accordingly.

Description

TECHNICAL FIELD[0001]The invention relates to a method and to an apparatus for increasing the strength of phase-based watermarking of an audio signal.BACKGROUND[0002]A challenge of audio watermarking systems in which an acoustic path is involved is the robustness against microphone pickup. Especially in case of surrounding noise, it is very difficult to detect a watermark embedded in a watermarked signal that is played back via loudspeaker, cf. [1].SUMMARY OF INVENTION[0003]A problem to be solved by the invention is to improve the detection of watermark data that is embedded in a watermarked audio signal. This problem is solved by the method disclosed in claim 1. An apparatus that utilises this method is disclosed in claim 2.[0004]Advantageous additional embodiments of the invention are disclosed in the respective dependent claims.[0005]The invention is related to watermark detector compatible robustness increase of phase based watermarking systems. For increasing the robustness of ...

Claims

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Application Information

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IPC IPC(8): G10L19/018G10L19/02
CPCG10L19/0204G10L19/018
Inventor ARNOLD, MICHAELBAUM, PETER GEORGCHEN, XIAOMINGGRIES, ULRICH
Owner MAGNOLIA LICENSING LLC
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